Mobile learning opportunities for EFL learners

The present article considers mobile learning in terms of the use of mobile devices potential for EFL acquisition. It reviews the principles, definition, and actuality of mobile learning, considers the difference between mobile learning and electronic learning. Also, the article provides the list of widespread mobile applications used by the learners nowadays with their description and indicates the experimentally obtained data concerning the advantages and disadvantages of incorporation m-learning into mainstream education. В статье рассматривается потенциал мобильного обучения в изучении иностранного языка (на примере английского языка). Обоснована актуальность мобильного обучения, показаны его отличия от электронного обучения, представлены принципы мобильного обучения, описаны популярные мобильные приложения, экспериментально выявлены преимущества и недостатки каждого исследуемого мобильного приложения

The increase of ultrasound measurements accuracy with the use of two-frequency sounding

In the article the new method for detection of the temporary position of the received echo signal is considered. The method consists in successive emission of sounded impulses on two frequencies and also the current study is concerned with the analysis of ultrasound fluctuation propagation time to and from the deflector on every frequency. The detailed description of the mathematical tool is presented in the article. The math tool used allows the authors to decrease the measurement error with help of calculations needed